Oka Domain

The Oka Domain was a feudal state of the Tokugawa Shogunate-era Japan that controlled Bungo Province, Buzen Province, and Tsukushi Province in northern Kyushu and Nagato Province and Suo Province on Honshu. They were loyal to the shogunate during the Boshin War.

History
The Oka Domain was led by the Nakagawa clan, who had been loyal to the Tokugawa since the 1500s. The Nakagawa were awarded with several provinces in northern Kyushu and southern Honshu, and they were loyal to the Shogunate for over 200 years. In 1864, they were the bulwark against expansion by the Choshu Domain and Satsuma Domain, and they fought against the Satsuma in a war on Kyushu in hopes of stopping their advance north.